The sill plate of a building is the bottom most horizontal part of a wall. The sill plate or sill as it is known in the United States, is most often comprised of wood, but could also be made of steel or other materials that are strong in nature. The sill of the building is load bearing and provides support for the bottom of the building so that the building has something to rest on. In many cases the sill is used to hold up the framing of the building and to provide the necessary support to the wall of the building.
If you are building a new home your contractor will want to create new sill plates around the building to help stabilize it. You might also need help from a contractor if you are creating an addition onto your home or if you are lifting the structure up for a new foundation or for foundation repair. This may require a new or repaired sill plate to be put into place during the construction. If you find that your building is losing its balance and seems to be starting to move to one side, you might have a contractor look over the sill plate to see if it is still standing strong. A termite infestation, water damage or dry rot can cause severe issues with the sill plate of a building warranting a replacement or major repair of the sills of the building in order to create the support needed.